Yep, the general rule is that parks are encouraging social distancing between different groups of people. So within in your group (ie - household), you can stand as close as you like to each, sit together on rides, etc.
Anyone outside your group, you have to maintain the 1.5m / 6ft / 2m (depending on country) distance and you should be sat away from them on any rides.
Many reports I've seen, however, have suggested that enforcing this is particularly difficult / staff just aren't bothering with it, particularly in queues and pathways